Question

我正在尝试使用AFNetworking在每个请求的基础上设置自定义标头，但有时候标头在设置后似乎会消失。以下是用于提出请求的代码......

+ (void) getWithURI: (NSString*) uri header: (NSDictionary*) header success: (NSString*) successCallback failure: (NSString*)errorCallback dispatch: (NSString*)dispatchedId
{
    createManagerInstance();

    AFHTTPRequestOperation* operation = [manager GET:uri
                                          parameters:nil
                                             success:^(AFHTTPRequestOperation *operation, id responseObject) {
                                                 [RestWrapper succeededWithJson:operation.responseString dispatchedId:dispatchedId successCallback:successCallback];
                                             } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                                                 [RestWrapper failedWithJson:operation.responseString dispatchedId:dispatchedId errorCallback:errorCallback];
                                             }];

    NSMutableURLRequest* request = (NSMutableURLRequest*)operation.request;
    for (NSString* key in header)
    {
        if([request valueForHTTPHeaderField:key] != nil)
        {
            [request setValue:header[key] forHTTPHeaderField:key];
        }
        else
        {
            [request addValue:header[key] forHTTPHeaderField:key];
        }
    }
    NSLog(@"Headers: %@", request.allHTTPHeaderFields);

    [operation start];
}

对于95％的请求，他们按预期进行。但是，偶尔会有一些失败并指示标题丢失。通过使用Fiddler捕获有问题的请求并看到标题实际上已丢失，已经证实了这一点。尽管如此，request.allHTTPHeaderFields的控制台日志始终显示标题。

我注意到的另一件事是，一般来说，Fiddler会为每个请求报告缓存策略为“max-age = 0，private，must-revalidate”。但是，每当请求丢失自定义标头时，它的缓存策略就是“无缓存”。

Answer 1

这是因为您以错误的方式添加HTTP标头字段。

您应该在请求之前添加它。你可以尝试这样的事情：

+ (void) getWithURI: (NSString*) uri header: (NSDictionary*) header success: (NSString*) successCallback failure: (NSString*)errorCallback dispatch: (NSString*)dispatchedId{
createManagerInstance();

manager.requestSerializer = [AFJSONRequestSerializer serializer];

[manager.requestSerializer setValue:header[key] forHTTPHeaderField:key];

AFHTTPRequestOperation* operation = [manager GET:uri
                                      parameters:nil
                                         success:^(AFHTTPRequestOperation *operation, id responseObject) {
                                             [RestWrapper succeededWithJson:operation.responseString dispatchedId:dispatchedId successCallback:successCallback];
                                         } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                                             [RestWrapper failedWithJson:operation.responseString dispatchedId:dispatchedId errorCallback:errorCallback];
                                         }];

[operation start];

}

设置后AFNetworking请求标头丢失

1 个答案: